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Blue-winged Olives

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Mayfly Family Ephemeridae (Hexes and Big Drakes)

Several great superhatches come from this family. The Green, Yellow, and Brown Drakes all belong to the Ephemera genus. Hexagenia and Litobrancha contain the largest mayflies in North America and present tremendous fly fishing opportunities.

Nymph biology

Nymphs of this family are nocturnal and their pale bodies sensitive to the sunlight. They build U-shaped burrows less than six inches into the stream bottom, where they feed on microorganisms in the fertile sediment. They come out of these burrows to molt up to 30 times throughout their development.

It common in this family for nymphs to live 2-3 years before emerging. This is very unusual among the mayflies.

Specimens of the Mayfly Family Ephemeridae

11 Female Duns
4 Male Duns
2 Duns
10 Male Spinners
4 Female Spinners
26 Nymphs

7 Streamside Pictures of Ephemeridae Mayflies:

3 Underwater Pictures of Ephemeridae Mayflies:

Recent Discussions of Ephemeridae

Hex hatch water temperature range?
4 replies
Posted by NEMatt on May 23, 2014 in the species Hexagenia limbata
Last reply on Jul 5, 2016 by Bombillo

New to the site - love it. I was wondering if there was a suggested range of water temperature at which the Hex likes to hatch.

What is the big DEAL about the HEX?
21 replies
Posted by Spinner on Jun 21, 2006 in the species Hexagenia limbata
Last reply on Jul 5, 2016 by Bombillo
fishing in the dark.......
stepping in holes?

I hate the dark........

I don't need the hex........

Green Drake Hatch Temp?
1 replies
Posted by NEMatt on May 23, 2014 in the species Ephemera guttulata
Last reply on May 24, 2014 by Entoman

I was looking for a water temperature range for the Green Drake hatch. Anyone know?
Mayfly larvae -wigglers preservation as bait
20 replies
Posted by Teacherprea on Jun 2, 2007 in the species Hexagenia limbata
Last reply on Apr 29, 2014 by TNEAL
I am a fly fisherman but not a "purist". A friend of mine has a place on the UP of Michigan. He just called me and said a guy told him there is a way to preserve "wigglers." They use them alot up north, those that are not fly fishermen or ladies. They are fishing perch, bluegill and crappie. He heard there is a way to "blanch" them.Drop them in hot water for a few minutes and they turn rubbery. They then will keep indefinitely. Has anyone heard of this? If so, how close to correct is the procedure I mentioned??
Thanks for anyone's help.
GD Shuck
10 replies
Posted by Martinlf on May 29, 2013 in the species Ephemera guttulata
Last reply on Jun 2, 2013 by Crepuscular
Jason's photo of a GD shuck suggests that at hatch time the backs of the nymphs may be a greyish or grey olive color. Possibly useful information, if this is an accurate surmise.

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» Family Ephemeridae (Hexes and Big Drakes)
Genus in Ephemeridae
Identification Keys
Family Range
Common Name
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